Furnace for roasting ores



(No Model.) A 2 sheets-sheer 1.

H. P. HOLLAND. PURNAGE FOR ROASTING oms.

No. 546,450. Patented Sept. 17, 1895.

2 Sheets-Sheet 2,

` (Remodel.) Y

H. P',30LLAND. PURNAGE Perg ROASTXNG- ORES. No. 546,450.'

Patented Sept, l?, 1895.

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UNITED STATES PATENT @Erica HENRY P. HOLLAND, OF SAN FRANCISCO,CALIFORNIA.

FURNACE FOR ROASTING CRES.

SPECIFICATION forming part of Letters Patent No. 546,450, datedSeptember 17, 1895.

Application fusa october e, isosf Serial No. 487;699 (No model.)

To @ZZ whom it may concern.- Y

Be it known that I, HENRY P. HOLLAND, ot San Francisco, county of SanFrancisco, and State of California, have invented a certain new anduseful Improvement in Furnaces for Roasting Ores-viz., a blowpiperoastingfur nace-.of which the following is a specication.

My invention relates to improvements in furnaces for roasting ores, thesame being operated by compressed air blown through pipes into thefurnace-fires to intensify the heat, and also for moving the ore insuspension by means of compressed air forced into the worm, raising theline particles of ore by the force of the compressed air and more orless separating them and carrying them in suspension, passing the orethrough a worm construction extending from the ore-feeder through thefurnace to a double kettle therein, said worm being so constructed inthe inside ot' the furnace that it maybe completely enveloped in flame,having a small liuc entering the bottom part of each coil, into whichthe compressed air and llame lling the furnace is forced by theaircompressor or blower Jfrom outside, and by which means the ore in theworm is subjected to the intense heat of the flame, both from within andWithout the Worm, and is carried forward by the force of the air fromthe hues through the worm into the double kettle at the end et it, whereit is subjected still further to the intensest heat, and from there itis forced and carried forward into the receiver at the.

far end of the furnace, being thoroughly roasted from its passagethrough the Worm and the double kettle. The worm through which the oreis carried by compressed air is constructed partly in coils and straightparts, for this reason: The coils of the worm prevent a too rapidpassage of the ore through it, so as to give more time for roasting. Thestraight parts of the constructions are provided so as to give the ore achance to get an impetus to aid in carrying it forward through the nextcoils. The ore is carried in suspension by the force of the compressedair, as sand is carried in the air in a sandstorm. It is caught up andcarried with great force by the wind force. The smoke and gases as theypass into the watertank are washed or puriedand passoft from the tankthrough escape-pipes therein. The re-boxes are surrounded by a doublewall, and underneath them, providing an air-chamber, into which the airis forced by the air-compressor through air-receiver D and pipes ct a aa. The double kettle is for the purpose of checking the ore in itspassage to ,the receiver, that it may be subjected to greater heat, andis constructed with the division-wall, as seen, for a partial Idetentionot the ore for that purpose. The receiver F is simply thc receptacle forthe ore when it arrives therein fully roasted. The ore is fed into theend of the worm at the front and upper end of the furnace through thefeed-hopper, being regulated by a revolving screw-shaped carrieroperated by belt connected with shafting.

The object of my invention is to provide an ore-roasting furnace thatwill roast cre rapidly, subjecting it to intense heat, by means of theaircompressor, airreceiver, and the blowpipes, by which the furnaceresare intensified to a tierce heat for a rapid roasting of the ore,providing, also, for the speedy moving and handling of the ore bycompressed air. I attain these objects by the mechanism illustratedbythe following draw- IDO'SZ zFigure 1 is a perspective view of theroasting-furnace, showing the ore-feeder, the tireboxes, theore-receiver, the water-tank, the air-compressor, the air-receiver, andthe airpipes connecting it with the four fire-boxes. Fig. 2 is a sectionthrough one of the reboxes and the worm, showing the air-spaces in thehollow walls and under the bottom of the fire-boxes, the supports of theworm, and also the blow pipe-passages in the same. Fig. 3 'is ahorizontal section through one of the four fire-boxes, showing thedouble walls, the supports ot the inner wall, the air-spaces between thewalls, and the compressedair passages in the bottom of the lire-boxes.Fig. 4 is a perspective View of the roasting-furnace with the top andpart of the front wall broken'away, showing whole length of the Worm,the ore-feeder by means of which the ore enters the worm, theblowpipe-passages in the same, the double kettle, the ore-receiver, intowhich the worm discharges the ore, and the watertank,into which thesmoke IOO and gases enter and from which the gases escape into the air.Fig. 5 is a cross-section through the fourth fire-box containing thedouble kettle, showing the division Wall. Fig. Gisasection of theWorm,showingits construction and the passages through which thecompressed air and flames enter the worm.

A represents the four tire-boxes under the worm; B, the Wormconstruction through Which the ore passes; C, air-compressor; D,air-receiver into which the air is forced from the air-compressor; E E,double kettle into which the ore is delivered from the end of the Worm;F, ore-receiver into which the ore is discharged from the double kettle;G, a water-tank into which the smoke and fumes of the furnace passthrough pipe d and escape in gas through gas-escape e; ct a d a,air-pipes conveying compressed air from the air-receiver into theairspace in the double Walls of the furnace and from there, after beingheated, under the fire-boxes; b, airsupply pipe conveying compressed airfrom the air-compressor to the air-receiver; ccc c, air and tire finesentering the bottom of the coils of the Worm; f, pipe connecting doublekettle and ore-receiver; h 7L, inner Wall of the furnaces; z' t' 't' i,air-spaecs under tire-boxes and between the double walls of the furnaces; 7a 7c, supports under the Worm; ZZZZ, furnace-doors; m, divisionof double kettle; n, ore-feeder at the upper end of the furnace; o,screwcarrier regulating ore-feed as it is fed into the Worm; P,discharge end of Worin into double kettle; fr, straight parts connectingthe worms; s s s s, blowpipes in the bottom of the fire-boxes throughwhich the compressed air is forced under the fire after being heatedbetween the double Walls; t t t, supports under fire-boxes and the innerWalls of the furnaces; Z', discharge of ore-receiver.

W'hat I claim as my invention, and desire to secure by Letters Patent ofthe United States, is-

1. An ore roasting furnace consisting of the ore feeder, n, for feedingthe ore into the worm; the screw, 0, for regulating the passage of theore from the feeder to the Worm; the Worm B, having straight lengths,fr, between the sections of the Worm and extending from the ore feederto the double kettle through which Worm and straight lengths the ore iscarried from the ore feeder to the double kettle by the force of thecompressed air forced into said worm; the double kettle, E E, havingdivision, m, into which the ore is delivered from the worm discharge, P,and is subjected therein to intense heat; the ore receiver, F, intowhich the roasted ore passes from the double kettle through pipe, f; theore discharge, P, and pipe, f; the Water tank, G, into which the smokeand gases pass and are Washed; the gas escape pipe, e, for conductingoff the gases from the Water tank; the air and flame (lues, c c c c,entering the lower part of the coils of the Worm through whichcompressed air and flame are forced for carrying the particles of oreforward in suspension,and at the same time roasting them; the tireboxes, A; the inner Walls of the furnace, h 71., forming With the outerwall spaces for compressed air; the air spaces, im, under the fire boxesand between the walls; the supports, 7e k, under the Worm, and t t,under the tire boxes; the air passages, s .s s s, under the tire boxes,through which compressed air is forced into the fire boxes; the pipes,c. d u, a, conducting compressed air from the air receiver to thefurnace; the air receiver, D; the air supply pipe, b, for conveyingcompressed air from the air compressor to the air receiver; and the aircompressor, C; substantially as herein described and set forth.

2. In an ore roasting furnace, the combination of the worm, B, havingthe straight lengths, r, through which the ore is carried and roasted;the fire and flame fines, c c c c, entering the lower parts ofY thecoils of the Worin through Which compressed air and dame are forced forcarrying the particles of ore forward in suspension, and at the sametime roasting them; the ore feed, n; the screw, o, for regulating thepassage of the ore from the ore feeder to the Worm; the double kettle, EE, at the end of the Wermfor subjecting the ore to greater heat, havingdivision, fm; the ore receiver, F, into which the roasted ore isdischarged from the double kettle; the connecting pipe, f; the Watertank, G, in Which the smoke and gases are Washed; the gas escape pipe,p; With the air compressor, C; the air supply pipe, ZJ; the airreceiver, D; the air conductors, d ct a a for conveying compressed airto the furnace; the air passages, s s s, through which the compressedair is forced into the tire boxes; the fireboxes, A; the air spaces, it'1l, under the fire boxes; the inner Walls of the furnace, h, 72; thesupports, /t ft', under the Worm, and tt under the tire boXes,-substantially7 as herein described and set forth.

3. In an ore roastingfurnaee, the combination of the Worm, B, havingstraight parts, fr; and the air and ame ues, c c c; the discharge, P;the double kettle, E E, into which the ore is discharged from the Wormand su bjected to intense heat; the ore feeder, n; the screw, o, forregulating the passage of the ore from the ore feeder to the Worm; thereceiver, F, for receiving the roasted ore from the double kettle; theore discharge, P, and pipe, f; the air compressor, C; the supply pipe,b; the air receiver, D; the air passages, s s s, under the fire boxesthrough which the compressed air is forced into the fire boxes; the tirebox, A; the inner Wall h- 7L the air spaces, t' r', under the reboxesand between the Walls of the furnace; the supports ic A, under the worm,and t 15 under the fire boxes; with the Water tank, G; and gas escapepipe, e,-substantially as herein described and set forth.

e. in an ore roasting furnace, the combination of the passages, s s s,in the bottom of IGS the fire boxes through which compressed air isforced therein; the inner Wall h h the air spaces, fi 'i under said lireboxes and between the inner and outer Walls of the furnace; thesupports, 7a k, under the Worm and t under the re boxes; the air pipes,a a a, conveying compressed air from the air compressor to the furnace;the air receiver, D the air supply pipe, Z), conveying compressed airfrom the air compressor to the air receiver; with the compressed air andflame, c c c, entering the lower part of the coils of the worm, throughwhich compressed air and flame are forced into the Worm, roasting theore and moving the particles of ore in suspension through the Worm; theWorm, B, through which the ore is conveyed by compressed air, and at thesame time roasted therein; the ore feeder, n; and the screw, o, forconveying and regulating the ore being fed into the worm; the discharge,P; the double kettle E E, into which the ore `is discharged from theworm; the receiver, F,

into which the ore is discharged from the double kettle; the connectionf, the Water tank, G, and the gas escape, e, for conducting off thegases from the tank, substantially as herein described and set forth.

5. In an ore roasting furnace, the combination of the double kettle, EE, through which the ore is carried by compressed air as it isdischarged from the Worin; with the ore receiver, F, for receiving theroasted ore from the double kettle; the water tank, G; the gas escapepipe, e, for conducting off the gases from the water tank; the kettleconnection, f; the division, m, in the double kettle for the purpose ofretarding and retaining the ore in its passage to the receiver inintense heat; the ore feeder, n, and screw regulator, o, for conveyingthe ore feed to the Worm, and regulating the saine in its passagethereto; the worm, B, through which the ore is conveyed in compressedair and roasted; the air and fiame lues, c c c, entering the lower partof the coils of the Worin through which compressed air and liame areforced for moving the particles of air forward in suspension, and at thesame time roasting the ore; the air spaces, the inner wall 7L h t' i,under the fire boxes, and between the walls of the furnace; the lireboxes, A; the supports, 7o 7e under the Worm, and t t under the fireboxes; the air pipes, aa c a, conducting the co1n pressed air from thereceiver to the furnace; the air receiver, D; the air supply pipeconveying compressed air from the air compressor to the receiver; andthe air coinpressor, Cif-substantially as herein described and setforth.

HENRY P. HOLLAND.

Witnesses:

HUBERT BANKART, BENJAMIN A. BARNEY.

